I've never seen one that is still sweeping after a two months. There is an attachment, you can get that turns a stationary powerhead into a sweeper. But its bulky and needs to be mounted on the top of the tank, has a pole with cage for the regular powerhead to hold it and spin it. Really looks to intrusive in the tank. Some of the books by John Tulluck have pictures of it, doesn't say who makes it.